Incinerate

A fast blast of fire – 60 damage.

Incinerate is the Expert upgrade of Firebolt: faster and hotter, with 60 fire damage per hit. Its high speed makes it a good choice against dragons.

Tips

Augmented Flames brings it up to 90 damage.

School: Destruction (Expert)
Effect: A blast of fire that does 60 points of damage. Targets on fire take extra damage.
Base Magicka cost: 171
Casting: Fire and Forget, aimed
Spell tome: Spell Tome: Incinerate – value 710 gold, ID 0010F7F4

Flames (Novice), Frostbite (Novice), Sparks (Novice), Fire Rune (Apprentice), Firebolt (Apprentice), Frost Rune (Apprentice), Ice Spike (Apprentice), Lightning Bolt (Apprentice), Lightning Rune (Apprentice), Chain Lightning (Adept), Fireball (Adept), Flame Cloak (Adept), Frost Cloak (Adept), Ice Storm (Adept), Lightning Cloak (Adept), Whirlwind Cloak (Adept), Icy Spear (Expert), Thunderbolt (Expert), Wall of Flames (Expert), Wall of Frost (Expert), Wall of Storms (Expert), Blizzard (Master), Fire Storm (Master), Lightning Storm (Master).

Cost, effect and tome value read from the Skyrim game files (base values before skill, perks and gear).

Faralda at the College from Destruction 70; Enthir sells it too, but more expensively.
Chests at higher levels.

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